jdbc

问题 Is there any way to know the name of the tables involved in a SQL query executed via JDBC? For example: SELECT r.roleId FROM User u, UserRole r where r.userId = u.userId and u.name = "Jonh Smith" I don't want only the result set of this query but the actual table names ("User" and "Role"). I don't care about view names, but if there is no way to get the underlying table used in the view it's not a big problem, but this has to work with nested queries. As for why I need this information it's

问题 Mysql 5.7 introduced the JSON data type which offers tonnes of query functions. Since there isn't a compatible resultset function, how and what to i do use retrieve the data stored in this datatype. 回答1: It should be rs.getString , because getString used with VARCHAR , TEXT , we can consider JSon like a String type, so you can get the result, using getString . Simple Example Double check with MySQL 5.7 and PostgreSQL 9.4 : MySQL 5.7 SQL create database db_test; create table table_test(json

问题 Mysql 5.7 introduced the JSON data type which offers tonnes of query functions. Since there isn't a compatible resultset function, how and what to i do use retrieve the data stored in this datatype. 回答1: It should be rs.getString , because getString used with VARCHAR , TEXT , we can consider JSon like a String type, so you can get the result, using getString . Simple Example Double check with MySQL 5.7 and PostgreSQL 9.4 : MySQL 5.7 SQL create database db_test; create table table_test(json

问题 Mysql 5.7 introduced the JSON data type which offers tonnes of query functions. Since there isn't a compatible resultset function, how and what to i do use retrieve the data stored in this datatype. 回答1: It should be rs.getString , because getString used with VARCHAR , TEXT , we can consider JSon like a String type, so you can get the result, using getString . Simple Example Double check with MySQL 5.7 and PostgreSQL 9.4 : MySQL 5.7 SQL create database db_test; create table table_test(json

问题 I'm implementing a Spring + MSSQL Server 2008 application. I use SimpleJDBCCall API to execute stored procedures and retrieve results. For stored procedures with mono table results, it works fine, but I don't know how to use it for procedures with multi table results. Sample procedure body: multi table results SELECT * FROM TABLE1 SELECT * FROM TABLE2 回答1: I was most ignorant, it does in fact work! You can specify both resultsets, with each its own mapper. In code it looks like this:

问题 I'm implementing a Spring + MSSQL Server 2008 application. I use SimpleJDBCCall API to execute stored procedures and retrieve results. For stored procedures with mono table results, it works fine, but I don't know how to use it for procedures with multi table results. Sample procedure body: multi table results SELECT * FROM TABLE1 SELECT * FROM TABLE2 回答1: I was most ignorant, it does in fact work! You can specify both resultsets, with each its own mapper. In code it looks like this:

问题 I'm implementing a Spring + MSSQL Server 2008 application. I use SimpleJDBCCall API to execute stored procedures and retrieve results. For stored procedures with mono table results, it works fine, but I don't know how to use it for procedures with multi table results. Sample procedure body: multi table results SELECT * FROM TABLE1 SELECT * FROM TABLE2 回答1: I was most ignorant, it does in fact work! You can specify both resultsets, with each its own mapper. In code it looks like this:

问题 Spring batch step fails when JdbcPagingItemReader query has a join and alias. It works fine when I remove the join and just do a simple query from employee table. Below is the code snippet that fails. Did anyone encounter such an issue ? Any help would be appreciated. spring-batch-core-4.0.1.RELEASE spring-boot-2.0.0.RELEASE @Autowired @Bean(destroyMethod = "") @StepScope public JdbcPagingItemReader<String> dbItemReader(final DataSource dataSource, final PreparedStatementSetter paramSetter) {

问题 Spring batch step fails when JdbcPagingItemReader query has a join and alias. It works fine when I remove the join and just do a simple query from employee table. Below is the code snippet that fails. Did anyone encounter such an issue ? Any help would be appreciated. spring-batch-core-4.0.1.RELEASE spring-boot-2.0.0.RELEASE @Autowired @Bean(destroyMethod = "") @StepScope public JdbcPagingItemReader<String> dbItemReader(final DataSource dataSource, final PreparedStatementSetter paramSetter) {

问题 I am using Spring JDBCTemplate and BatchPreparedStatementSetter to perform batch Update on a postgreSql DB. I wanted to capture the erroneous records and after going through some posts, found out that catching the BatchUpdateException and then looking for 'Statement.EXECUTE_FAILED' could help me identify the records that were erroneous. However, when I implement it as below, I never get a batchUpdate exception. Here I am trying to enter the same id "120" repeatedly so that I get a unique